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通过12Cr10Co3MoW1VNbNB钢的持久试验及对持久试样的金相组织、位错、析出相进行的微观观察分析,得出当材料在较高温度或实际使用过程中,试验用钢在温度与应力作用下在板条马氏体界附近位错墙的形成加快了材料组织的劣化;第二相的析出阻碍位错运动,提高了材料的高温长时性能。但是,材料在整个服役过程中,板条马氏体晶界析出相的不断长大,新的马氏体边界不断形成,导致材料组织劣化,失效断裂。
Through the long-term test of 12Cr10Co3MoW1VNbNB steel and the microscopic observation and analysis of the microstructure, dislocation and precipitated phase of the long-lasting sample, it is concluded that when the material is at a higher temperature or in actual use, the temperature and the stress of the test steel The formation of dislocation walls near the lath martensite accelerates the deterioration of the material structure. The precipitation of the second phase impedes the dislocation movement and improves the high temperature long-term performance of the material. However, during the whole process of service, the precipitated martensite grain boundary of the slab continues to grow and the new martensite boundary continuously forms, resulting in the deterioration of the material structure and failure.